Spark-plug and sparking circuit.



L. H. JENSEN.

SPARK PLUG AND SPARKING cmcun. APPLICATION man 05c. 26. 19,4.

Patented July 18, 1916.

i 5 A A A I .wwwe/z wim newnnucn H. JENSEN, or-str. ensures, rLLrNoIs.

SPARK-PLUG; m) srAnKIn'G CIRCUIT.

Speeificationof Letters Patent.

7 Application filed December as, 1914. Serial no. 379,003.

' To all w/wm itmag concern:

, spark.

' Be it known that I, LAWRENCE H. JENSEN,

a citizen of the United States,- and a resident of St. Charles, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Spark-Plugs and Sparking Circuits, of which the following is a specification.

My present invention-relates to improvements in spark plugs and sparking circuits and has special reference to that variety .of

spark plugs or sparking. circuits in which.

are provided a plurality of spark gaps,

across which the current must jump, in order to produce the spark andthe object of my jinventio is to increase the intensity ofthe I attain the above object by means of the structure illustrated in the accompanying drawings in which:

Figure 1 is apla-n of the-end of the spark trally bored to receive the insulating core, and the central bore is flared in the body portion at (3, and at the upper end of the flare the central bore is enlarged and interiorly threaded, at 8, to receive the retaining nut, 9, which is also centrally bored for the passage of the insulating core, 10. The inner end, 7, of the core, 10, is preferably made cylindrical to pass through the central bore in the reduced end, 5, of the body portion, and above the cylindrical portion, 7, it is given a conical form, at 11, to it within the flared portion, 6, of the body portion,

' and above the conical portion, 11, it is provided with an annular shoulder, 12, which fits within the enlarged portion, 8, of the bore in the body portion, and upon the upper end of the annular shoulder, 12, abuts the lower end of the retaining nut, 9. Above the annular shoulder, 12, the core is preferably made cylindrical so as to extend stand a considerable degree of heat and retain its insulating properties. In the insuretaining nut, 9. c y

The insulating core, 10,' is made of porce- Patented July 18, 1216.

through and above the central bore of the lain, mica,- lava, or any' naterial which-will,

lating core, 10, are provided a plurality,

preferably four, longitudinal channels, 13,- 14, 15, and 16 for the reception of the conductors comprising the sparking circuit,

and at the outerend of thecore are two ra-.

dia-lly and transversely disposed channels, 17 and 18 leading into and communicating with respectively" two of the longitudinal channels, in thisfinstance, channels 13 and 15.-

The wiring of the core is accomplished by 5 inserting pieces of. conductors, of suitable size and length into the longitudinal chan nels. The upper or inclosed end of the piece of conductor which occupies the channel, 13, is twisted backupon itself to provide a loop,

19, which engages a hook, 20, upon the end 17. lhe outer end. of the rod 21 is threaded and is held in place by a retaining nut, 22, and. an outer or cap nut, 23, is provided be,-

Jof a rod, 21, extending through the channel,

tween the inner end of which and the retaining nut, 22, is held theconductor, 24, leading to the source of supply of the high; potential or sparking circuit. The end, 25, of the piece of conductor occupying longitudinal channel, '13, extends from the inner end of the core and is bent to extend toward the conductor extending from the next or nearest channel, 14. The conductors occupying the channels 14, 15. and 16, are preferably pieces of wire of suitable metal bent upon themselves so that there will be two ends extending from the opening of each channel upon the inner end of thecore, which ends maybe bent re spectively toward the channels on either side. The pieces of conductor occupylng channels, 14 and 16, may extend into their respective channels only sufliciently far to.

secure them substantially, but the conductor occupying the channel, 15, or the channel which connects with the radial channel, 18, should extend. sufficiently far back to engage a hook, 20, upon a rod, 21, disposed in said v10E;

channel, 18, and secured in position by a retaining nut, 22. To the rod, 21 is secured by a cap nut, 28, a length of conductor, 26, forming an open circuit extending into the air and not connected in circuit with either no body portion, 5, of the plug, which grounds or completes the high potential or sparking circuit through the metal of the motor.

A schematic view of the wiring is shown in Fig. 3. In this view I have illustrated a battery A and coil B as a source of supply for the high potential circuit C; but a magneto may be employed without departing from the spirit of my invention. The high potential circuit C is interrupted to provide spark gaps D, E, F, and G and to a portion of the circuit intermediate the gaps, preferably the central portion of suchcircuit is connected a length of open circuit H.

I have found that the addition of this length of open circuit connected to a portion of the high potential or sparking circuit, as

above described, and running into the air,

adds very sensibly to the intensity of the sparks produced across the spark gaps.

Having described-my invention what I claim as new and desire to secure by Letters Patent is 1. In a spark plug, a plurality of spaced conductors comprising a portion of a circuit having a plurality of interruptions or spark gaps, and means for connecting one of the intermediate spaced conductors with a length of conductor that is unconnected with the remaining portion of said circuit.

2. In a spark plug, a plurality of spaced conductors comprising a portion of a circuit having a plurality of interruptions or spark gaps, and a conductor connected with .one of menace the intermediate spaced conductors andun connected with the remaining portion of said circuit.

8. In a spark plug, a plurality of spaced-a nected to an intermediate portion of said 9 circuit and terminating in the atmosphere,

6. A spark-plug comprising a body portion, an insulating core mounted within saidbody portion, a plurality of longitudinal channels within said insulating core, conductors mounted within said longitudinal channels so as to project from one end thereof, one or more of said conductors havingbranched projecting ends, said conductors comprising with said body portion a portion of a circuit having a plurality of interruptions therein, and means for con necting an intermediate portion of said. in-

terrupted circuit with a length of conductor that is unconnected with the remaining por tion of said circuit.

In testimony whereof I have hereunto set my name in the presence of two witnesses.

' LAWRENCE H. JENSEN. Witnesses: E.- K. LUNDY, J12,

WM. HAROLD EIOHELMAN. 

